Most warning that have been issued by the police have asked the general public to be aware of others and to report anything which they believe to suspicious, In This case I thing You have done the right thing , no harm has been done and you;re suspicion’s have been alaid
I’m sorry but These so called professional screeners ,have on more than one occasion failed , my wife was stopped because they had seen what they believed to be knife in her luggage , she was stopped an the bag searched , nothing found , the reply of the so called Professional Screener ” Must have been another Bag” now dose that install confidense in these guys

nothing is fool proof espically when a human is involved